NS0-155 Online Practice Questions and Answers

Correct Answer: CDE

https://library.netapp.com/ecmdocs/ECMP1196986/html/GUID-E5AD37DE-2F44-47DB-90A3- C8E115FCBFB7.html SnapVault replicates at the file level not the block level. Deduplication is always a post-processed activity for Data OnTap, while compression is an inline process. The deduplication schedule depends on the SnapVault update schedule on the destination system. A new Snapshot copy replaces the archival Snapshot copy after deduplication finishes running on the destination system. (The name of this new Snapshot copy is the same as that of the archival copy, but the Snapshot copy uses a new timestamp, which is the creation time.) The SnapVault update recognizes the deduplicated blocks as changed blocks. Thus, when deduplication is run on an existing SnapVault source for the first time, all saved space is transferred to the destination system.

Correct Answer: ACD

https://library.netapp.com/ecmdocs/ECMP1196979/html/man5/na_snapmirror.conf.5.html Each relationship entry of the /etc/snapmirror.conf file is a single line containing space-separated fields.

The entry has this format:

Source destination arguments schedule schedule

This is the schedule used by the destination node for updating the mirror. It informs the SnapMirror scheduler when transfers will be initiated. The schedule field can contain the word sync to specify fully synchronous mirroring, semi-sync to

specify semi-synchronous mirroring, or a cron-style specification of when to update the mirror.

visibility_interval

The value for this argument is a number optionally followed by the suffixes: s (seconds), m (minutes) or h (hours). If a suffix is not specified, value is interpreted as seconds. This argument controls the amount of time before an automatic

snapshot is created on the source volume that is synchronously mirrored. The value is the number of seconds between automatically created snapshots. The default value is 3 minutes. A small number here can negatively affect the

performance of the mirror. This argument is ignored for asynchronous mirrors.

Outstanding (deprecated)

This argument controls the performance versus synchronicity trade-off for synchronous mirrors. The value for this argument is a number followed by the suffixes: ops (operations), ms (milliseconds) or s (seconds). Setting a value less than 10s

configures the mirror to run in fully synchronous mode. Setting a value greater than or equal to 10s configures the mirror to run in semi-synchronous mode. This argument is ignored for asynchronous mirrors. Please note that this is a

deprecated option. Use the schedule field to specify the synchronous mode for the mirror.

cksum

This controls which checksum algorithm is used to protect the data transmitted by SnapMirror. Currently supported values are "none", "crc32c", and "crc32c_header_only". The value "crc32c_header_only" has been added only for volume

SnapMirror and is not supported for synchronous SnapMirror and qtree SnapMirror.

Correct Answer: AC

Correct Answer: B

https://library.netapp.com/ecmdocs/ECMP1196991/html/GUID-06C70D3B-9A06-4D20-B140- EB147B941BDA.html

The data structures that are backed up and restored through SnapVault depend on the primary system. On systems running Data ONTAP, the qtree is the basic unit of SnapVault backup and restore. SnapVault backs up specified qtrees on the primary system to associated qtrees on the SnapVault secondary system. If necessary, data is restored from the secondary qtrees back to their associated primary qtrees. On open systems storage platforms, the directory is the basic unit of SnapVault backup. SnapVault backs up specified directories from the native system to specified qtrees in the SnapVault secondary system.

If necessary SnapVault can restore an entire directory or a specified file to the open systems platform. The destination system uses a slightly more disk space and directories than the source system.

Correct Answer: BCD

Correct Answer: B

http://www.netapp.com/us/system/pdf-reader.aspx?m=tr-3786.pdfandcc=us

The command to create a 64-bit aggregate is the same aggr create command that is present in Data ONTAP 7G for aggregate creation. The aggr create command has a new flag, -B, to specify the type of aggregate to create. It takes a value

of either 32 or 64 and creates the respective type of aggregate. Therefore the aggr create command with -B 64 creates a 64-bit aggregate. The aggr create command without the -B flag by default creates a 32-bit aggregate.

Here are some commands for creating different aggregate types in Data ONTAP 8.0:

Creating a 64-bit aggregate:

aggr create aggr_64 -B 64 5

Creating a 32-bit aggregate using B flag:

aggr create aggr_32 -B 32 5

Creating a 32-bit aggregate without using B flag:

aggr create default_aggr_32 5

Note: the man pages do not include this option in later versions of DOT because 64-bit is now the default.

Correct Answer: CE

https://library.netapp.com/ecmdocs/ECMP1196979/html/man1/na_igroup.1.html

igroup show [ -v ] [ initiator_group ] Displays the nodes in an initiator group and their aliases, set with the fcp wwpnalias command. If no initiator_group is specified, the members of all initiator groups are displayed. You can use the -v option to get a verbose listing.

https://library.netapp.com/ecmdocs/ECMP1196979/html/man1/na_lun.1.html

lun show [ -v | -m | -c ] [ all | mapped | offline | online | unmapped | staging | -g initiator_group | -n node | -l vol_name | lun_path ] Displays the status (lun_path, size, online/offline state, shared state) of the given LUN or class of LUNs. With the -v option supplied, additional information (comment string, serial number, LUN mapping, HA Pair Shared Volume Information) is also displayed. With the -m option supplied, information about lun_path to initiator_group mappings is displayed in a table format. With the -c option supplied, information about LUN cloning status is displayed.

Correct Answer: B

http://backdrift.org/man/netapp/man1/na_lun.1.html lun clone create clone_lunpath [ -o noreserve ] -b parent_lunpath parent_snap

Correct Answer: ADE

The fstab file reflects the defined filesystem mount paths (including NFS mounts). Always check network connectivity when a problem arises with a network service. The exportfs command will display the active exports on the storage system.

Correct Answer: D

https://library.netapp.com/ecmdocs/ECMP1196890/html/man1/na_aggr.1.html

aggr destroy { aggrname | plexname } [ -f ]

Destroys the aggregate named aggrname, or the plex named plexname. Note that if the specified aggregate is tied to a traditional volume, then the traditional volume itself is destroyed as well. If an aggregate is specified, all plexes in the

aggregate are destroyed. The named aggregate must also not contain any flexible volumes, regardless of their mount state (online, restricted, or offline). If a plex is specified, the plex is destroyed, leaving an unmirrored aggregate or

traditional volume containing the remaining plex.

Before destroying the aggregate, traditional volume or plex, the user is prompted to confirm the operation. The -f flag can be used to destroy an aggregate, traditional volume or plex without prompting the user.

The disks originally in the destroyed object become spare disks. Only offline aggregates, traditional volumes and plexes can be destroyed.